2x12 - Mr. Osomatsu

Jyushimatsu befriends a young boy named Eitarou but gets called in by Eitarou's mother when he starts imitating him. Contrary to Jyushimatsu's fears, however, she asks him to teach Eitarou jokes so he can make friends at school. Later, Dayon steals Dekapan's underwear, forcing him to give chase all over the city while butt naked.